"What we've learned over last 24-36 hours has given us concern for Kelly's welfare and concern whether she's seriously injured or perhaps even dead," said Susan Morrell, senior assistant attorney general. "We are reaching out the public and hoping someone can assist us with information regarding her disappearance and current whereabouts."

Morrell would not say what evidence led authorities to fear for Robarge's safety.

New Hampshire State Police, Sullivan County sheriff's office, state Fish and Game and Vermont State Police are assisting in investigation and search.